Allowance for Loan and Lease Losses (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015	Dec. 31, 2015
Allowance for loan losses [Roll Forward]
Beginning balance	$ 35,697	$ 35,190	$ 36,094	$ 34,447	$ 34,447
Provision charged to expense	2,191	2,520	5,829	6,740	8,650
Losses charged off	(2,962)	(2,899)	(8,729)	(7,819)	(9,870)
Recoveries	875	729	2,607	2,172	2,867
Ending balance	35,801	35,540	35,801	35,540	36,094
Allowance for loan losses ending balance [Abstract]
Individually evaluated for impairment	1,149	1,348	1,149	1,348	2,461
Collectively evaluated for impairment	34,652	34,192	34,652	34,192	33,633
Loans ending balance [Abstract]
Individually evaluated for impairment	55,045	48,339	55,045	48,339	49,888
Collectively evaluated for impairment	2,876,254	2,772,121	2,876,254	2,772,121	2,824,073
Commercial [Member] | Construction [Member]
Allowance for loan losses [Roll Forward]
Beginning balance	1,437	2,622	2,199	2,896	2,896
Provision charged to expense	54	151	(701)	(127)	(707)
Losses charged off	(79)	0	(94)	(2)	(3)
Recoveries	18	3	26	9	13
Ending balance	1,430	2,776	1,430	2,776	2,199
Allowance for loan losses ending balance [Abstract]
Individually evaluated for impairment	212	719	212	719	831
Collectively evaluated for impairment	1,218	2,057	1,218	2,057	1,368
Loans ending balance [Abstract]
Individually evaluated for impairment	5,938	8,080	5,938	8,080	6,263
Collectively evaluated for impairment	62,337	98,775	62,337	98,775	71,757
Commercial [Member] | Real Estate [Member]
Allowance for loan losses [Roll Forward]
Beginning balance	14,438	13,022	14,434	13,618	13,618
Provision charged to expense	585	293	1,726	577	2,135
Losses charged off	(319)	(364)	(1,505)	(1,290)	(1,379)
Recoveries	78	2	127	48	60
Ending balance	14,782	12,953	14,782	12,953	14,434
Allowance for loan losses ending balance [Abstract]
Individually evaluated for impairment	747	317	747	317	1,227
Collectively evaluated for impairment	14,035	12,636	14,035	12,636	13,207
Loans ending balance [Abstract]
Individually evaluated for impairment	35,848	31,153	35,848	31,153	33,421
Collectively evaluated for impairment	1,047,792	966,501	1,047,792	966,501	1,019,498
Commercial [Member] | Equipment Lease Financing [Member]
Allowance for loan losses [Roll Forward]
Beginning balance	94	113	79	119	119
Provision charged to expense	(28)	(9)	(13)	(15)	(40)
Losses charged off	0	0	0	0	0
Recoveries	0	0	0	0	0
Ending balance	66	104	66	104	79
Allowance for loan losses ending balance [Abstract]
Individually evaluated for impairment	0	0	0	0	0
Collectively evaluated for impairment	66	104	66	104	79
Loans ending balance [Abstract]
Individually evaluated for impairment	0	0	0	0	0
Collectively evaluated for impairment	6,242	9,146	6,242	9,146	8,514
Commercial [Member] | Other [Member]
Allowance for loan losses [Roll Forward]
Beginning balance	4,430	4,414	4,225	4,263	4,263
Provision charged to expense	185	153	1,156	1,054	1,338
Losses charged off	(622)	(431)	(1,667)	(1,495)	(1,961)
Recoveries	92	149	371	463	585
Ending balance	4,085	4,285	4,085	4,285	4,225
Allowance for loan losses ending balance [Abstract]
Individually evaluated for impairment	190	312	190	312	403
Collectively evaluated for impairment	3,895	3,973	3,895	3,973	3,822
Loans ending balance [Abstract]
Individually evaluated for impairment	11,770	7,917	11,770	7,917	8,460
Collectively evaluated for impairment	343,214	338,401	343,214	338,401	350,438
Residential [Member] | Construction [Member]
Allowance for loan losses [Roll Forward]
Beginning balance	558	570	550	534	534
Provision charged to expense	8	61	144	184	147
Losses charged off	(61)	(20)	(192)	(110)	(135)
Recoveries	4	0	7	3	4
Ending balance	509	611	509	611	550
Allowance for loan losses ending balance [Abstract]
Individually evaluated for impairment	0	0	0	0	0
Collectively evaluated for impairment	509	611	509	611	550
Loans ending balance [Abstract]
Individually evaluated for impairment	0	0	0	0	0
Collectively evaluated for impairment	55,412	62,226	55,412	62,226	61,750
Residential [Member] | Real Estate [Member]
Allowance for loan losses [Roll Forward]
Beginning balance	6,372	6,965	6,678	6,094	6,094
Provision charged to expense	330	564	440	2,023	1,888
Losses charged off	(366)	(647)	(849)	(1,260)	(1,421)
Recoveries	8	52	75	77	117
Ending balance	6,344	6,934	6,344	6,934	6,678
Allowance for loan losses ending balance [Abstract]
Individually evaluated for impairment	0	0	0	0	0
Collectively evaluated for impairment	6,344	6,934	6,344	6,934	6,678
Loans ending balance [Abstract]
Individually evaluated for impairment	1,489	1,189	1,489	1,189	1,744
Collectively evaluated for impairment	704,539	704,998	704,539	704,998	706,130
Residential [Member] | Home Equity [Member]
Allowance for loan losses [Roll Forward]
Beginning balance	819	867	839	756	756
Provision charged to expense	3	(38)	(1)	128	158
Losses charged off	0	0	(21)	(67)	(129)
Recoveries	2	41	7	53	54
Ending balance	824	870	824	870	839
Allowance for loan losses ending balance [Abstract]
Individually evaluated for impairment	0	0	0	0	0
Collectively evaluated for impairment	824	870	824	870	839
Loans ending balance [Abstract]
Individually evaluated for impairment	0	0	0	0	0
Collectively evaluated for impairment	89,467	88,624	89,467	88,624	89,450
Consumer [Member] | Consumer Direct [Member]
Allowance for loan losses [Roll Forward]
Beginning balance	1,634	1,541	1,594	1,574	1,574
Provision charged to expense	170	382	669	804	891
Losses charged off	(204)	(436)	(893)	(1,101)	(1,306)
Recoveries	111	113	341	323	435
Ending balance	1,711	1,600	1,711	1,600	1,594
Allowance for loan losses ending balance [Abstract]
Individually evaluated for impairment	0	0	0	0	0
Collectively evaluated for impairment	1,711	1,600	1,711	1,600	1,594
Loans ending balance [Abstract]
Individually evaluated for impairment	0	0	0	0	0
Collectively evaluated for impairment	131,815	125,847	131,815	125,847	126,406
Consumer [Member] | Consumer Indirect [Member]
Allowance for loan losses [Roll Forward]
Beginning balance	5,915	5,076	5,496	4,593	4,593
Provision charged to expense	884	963	2,409	2,112	2,840
Losses charged off	(1,311)	(1,001)	(3,508)	(2,494)	(3,536)
Recoveries	562	369	1,653	1,196	1,599
Ending balance	6,050	5,407	6,050	5,407	5,496
Allowance for loan losses ending balance [Abstract]
Individually evaluated for impairment	0	0	0	0	0
Collectively evaluated for impairment	6,050	5,407	6,050	5,407	5,496
Loans ending balance [Abstract]
Individually evaluated for impairment	0	0	0	0	0
Collectively evaluated for impairment	$ 435,436	$ 377,603	$ 435,436	$ 377,603	$ 390,130